#ifndef _ASM_GENERIC_PERCPU_H_ #define _ASM_GENERIC_PERCPU_H_ #include <linux/compiler.h> #include <linux/threads.h> #include <linux/percpu-defs.h> #ifdef CONFIG_SMP /* * per_cpu_offset() is the offset that has to be added to a * percpu variable to get to the instance for a certain processor. * * Most arches use the __per_cpu_offset array for those offsets but * some arches have their own ways of determining the offset (x86_64, s390). */ #ifndef __per_cpu_offset extern unsigned long __per_cpu_offset[NR_CPUS]; #define per_cpu_offset(x) (__per_cpu_offset[x]) #endif /* * Determine the offset for the currently active processor. * An arch may define __my_cpu_offset to provide a more effective * means of obtaining the offset to the per cpu variables of the * current processor. */ #ifndef __my_cpu_offset #define __my_cpu_offset per_cpu_offset(raw_smp_processor_id()) #endif #ifdef CONFIG_DEBUG_PREEMPT #define my_cpu_offset per_cpu_offset(smp_processor_id()) #else #define my_cpu_offset __my_cpu_offset #endif /* * Add a offset to a pointer but keep the pointer as is. * * Only S390 provides its own means of moving the pointer. */ #ifndef SHIFT_PERCPU_PTR #define SHIFT_PERCPU_PTR(__p, __offset) RELOC_HIDE((__p), (__offset)) #endif /* * A percpu variable may point to a discarded regions. The following are * established ways to produce a usable pointer from the percpu variable * offset. */ #define per_cpu(var, cpu) \ (*SHIFT_PERCPU_PTR(&per_cpu_var(var), per_cpu_offset(cpu))) #define __get_cpu_var(var) \ (*SHIFT_PERCPU_PTR(&per_cpu_var(var), my_cpu_offset)) #define __raw_get_cpu_var(var) \ (*SHIFT_PERCPU_PTR(&per_cpu_var(var), __my_cpu_offset)) #ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA extern void setup_per_cpu_areas(void); #endif #else /* ! SMP */ #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu_var(var))) #define __get_cpu_var(var) per_cpu_var(var) #define __raw_get_cpu_var(var) per_cpu_var(var) #endif /* SMP */ #ifndef PER_CPU_BASE_SECTION #ifdef CONFIG_SMP #define PER_CPU_BASE_SECTION ".data.percpu" #else #define PER_CPU_BASE_SECTION ".data" #endif #endif #ifdef CONFIG_SMP #ifdef MODULE #define PER_CPU_SHARED_ALIGNED_SECTION "" #define PER_CPU_ALIGNED_SECTION "" #else #define PER_CPU_SHARED_ALIGNED_SECTION ".shared_aligned" #define PER_CPU_ALIGNED_SECTION ".shared_aligned" #endif #define PER_CPU_FIRST_SECTION ".first" #else #define PER_CPU_SHARED_ALIGNED_SECTION "" #define PER_CPU_ALIGNED_SECTION ".shared_aligned" #define PER_CPU_FIRST_SECTION "" #endif #ifndef PER_CPU_ATTRIBUTES #define PER_CPU_ATTRIBUTES #endif #ifndef PER_CPU_DEF_ATTRIBUTES #define PER_CPU_DEF_ATTRIBUTES #endif #endif /* _ASM_GENERIC_PERCPU_H_ */